diff --git a/include/SdfLib/ExactOctreeSdfDepthFirst.h b/include/SdfLib/ExactOctreeSdfDepthFirst.h
index a1c79a1..ca6d858 100644
--- a/include/SdfLib/ExactOctreeSdfDepthFirst.h
+++ b/include/SdfLib/ExactOctreeSdfDepthFirst.h
@@ -1,6 +1,7 @@
 #ifndef EXACT_OCTREE_SDF_DEPTH_FIRST_H
 #define EXACT_OCTREE_SDF_DEPTH_FIRST_H
 
+#include <cstring>
 #include <string>
 #include <stack>
 #ifdef OPENMP_AVAILABLE
diff --git a/src/tools/SdfLibUnity/SdfExportFunc.cpp b/src/tools/SdfLibUnity/SdfExportFunc.cpp
index ff4e017..85d7842 100644
--- a/src/tools/SdfLibUnity/SdfExportFunc.cpp
+++ b/src/tools/SdfLibUnity/SdfExportFunc.cpp
@@ -1,3 +1,4 @@
+#include <cstring>
 #include "SdfExportFunc.h"
 #include "spdlog/sinks/rotating_file_sink.h"
 
diff --git a/src/utils/Mesh.cpp b/src/utils/Mesh.cpp
index 8bc7c6a..9ce200b 100644
--- a/src/utils/Mesh.cpp
+++ b/src/utils/Mesh.cpp
@@ -1,5 +1,6 @@
 #include "SdfLib/utils/Mesh.h"
 #include <iostream>
+#include <cstring>
 #include <assert.h>
 #include <spdlog/spdlog.h>